Bolt for door-locks



(No Model.)

A. SOHWEINFURT.

, BOLT FOR DOOR LOOKS. No. 329,494. I Patented Nov 3, 1885.

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UNITE TATES PATENT FFlCE-Q BOLT FOR DOOR-LOCKS.

SPEGIFIGATION forming part of Letters Patent No. 329,494, dated November3, 1885.

Application filed April 2. 1885.

To all whom it may concern.-

Be it known that I, AUGUSTUS SoHwnIN- FURT, a citizen of the UnitedStates, residing at Philadelphia, in the county of Philadelphia andState of Pennsylvania, have invented a new and useful Improvement inBolts for Door-Locks, of which the following is a specification.

My invention consists of an improvementin bolts of locks, constructed ofsheet metal, cut and flanged by means of dies of the requiredconformation in punching-presses in such a manner as to give therequisite shape and strength to the bolt, hereinafter more fullydescribed. Bolts for door-locks have generally been made of cast metal,preferably of malleable iron, through which a hole has been drilled inthe main portion to rivet thereto a stem or shank of the knob thatprojected outside of the plate of thelock. A helical spring, whose endsare confined between shoulders of the bolt and a stud on the innerfaceof the plate,causes the outward beveled end of said bolt to be alwaysprojected outside of the rim of the lock, to act as a catch, inconnection with a mortised keeper on the jamb of the casing, to retainthe door in its closed position. This method of constructing bolts ofcast metal has been found to be objectionable, the chief reason of whichwas that in drilling a hole through the body for the insertion of theshank of the knob, which extended through the plate, the bolt was soweakened as to be unable to withstand the strain. As a consequence manywere broken during the process of fitting up the locks, involving muchloss of time and'material.

To overcome the objections and difficulties in the manufacture and useof cast-iron bolts is the object of my invention. Rolled metal ofsuitable thickness is used, preferably of brass, on account of itsductility, and the sheet passed between dies of desired conformation,which cut the blanks therefrom. A. second pair of dies is then used,between which the blanks previously out are inserted, which turn up atone side the parallel flanges upon the edges or the plate, forming thebolt ready for its connect-ion with the plate of the lock. The

hole for the connection of the shank of the knob may be punched by thedies that cut the blank, or by those that flange, at option, or it maybe drilled, as best suits convenience.

1n the accompanying drawings, which make Scl'litl No. 161,066. (Nomodel.)

a part of this specification, Figure 1 is a face view of a spring lockor closetcatch, showing my improved bolt connected therewith. Fig. 2 isan end view of the same. Fig. 3 is an inner face view. Fig. 4 is an edgeview. Fig.

5 is a face view of the blank E before undergoing the fianging processto form the bolt 13. Figs. 6 and 7 are opposite face views of the boltB. Fig. 8 shows an end view of the bolt and lock'plate with the stud Kleft standing in the rim.

Like letters of reference in all the figures indicate the same parts.

A is the lock-plate, and A the rim ofthe same, projected at right anglesthereto, the plate and rim being provided with the customary screw holesfor attachment to the face of a door.

B in the drawings represents a sliding bolt attached to the plate A,which is actuated in its lateral movements by means of the knob O, thatis riveted thereto by the shank a, passing through said bolt, theslot 1) in the plate permitting of the free lateral movements of thebolt.

D is a helical spring surrounding the shank d of the bolt, one end ofwhich rests between the shoulders e e and the opposite endagainst theface of the stud g, by which means the resilient action of the springalways keeps the end Z of the bolt extended outside of the rim of theplate, to insure its acting as a catch.

A further description of the operation of the lock is not necessary,being well known.

My improvement consists only in the bolt, which I construct of sheetmetal, preferably of brass, on account of its being easily bent with outdanger of cracking at the corners.

In the preliminary operation a sheet of metal of proper thickness is fedinto and between the male and female dies of a punching-press, which cutthe sheet into the flat blanks E, a face view of one being shown in Fig.5. The blanks are again fed separately and successive 1y between anotherpair of (lies of proper formation, which turns up the edges of the blankat right angles to the main portion, forming the flanges 2' t' parallelto each other upon one surface of the bolt.

My improvement is applicable to all kinds of locks for use upon doors,whether springcatch, similar to the illustration, or to deadlatch, rim,and mortise lock, or to door-bolts.

I save metal by my method of construction,

and the liability of the breakage of a bolt is entirely obviated indrilling a hole for the'insertion of the shank of the knob, as the holemay be punched either from the blank or from the bolt when flanged. i

I claim as my invention- The bolt B for door-locks, constructed of sheetmetal, and provided with the flangesz'i,

bent over upon one of the faces of. the blank at right angles to themain portion, substantially IO as shown and described, for the purposeset forth.

' AUGUSTUS SOHWEINFURT.

Witnesses:

THOMAS J. 'BEWLEY,

SAML. B. S. EARTH.

